Foliar Iron Fertilization of Peach (Prunus persica (L.) Batsch): Effects of Iron Compounds, Surfactants and Other Adjuvants

摘要: Experiments to assess the capability of different combinations iron (Fe) compounds and adjuvants provide Fe via foliar application Fe-deficient plants have been carried out. A total 80 formulations containing (1) one five Fe-compounds [FeSO4·7H2O, Fe(III)-citrate, Fe(III)-Ethylenediaminetetraacetic acid (EDTA), Fe(III)-Diethylenetriamine pentaacetic (DTPA), Fe(III)-Iminodisuccinic (IDHA)], (2) a surfactant (Mistol, alkyl-polyglucoside1 or alkyl-polyglucoside2), (3) an adjuvant (glycerol, methanol glycine–betaine) were studied with respect leaf wetting ability surface tension. From initial only 26 resulted in adequate wetting, 20 alkyl-polyglucoside2 3 each Mistol alkyl-polyglucoside1, some them (four alkyl-polyglucoside2, Mistol, three alkyl-polyglucoside1) found inadequate tension values for use as fertilizers. In second experiment, listed above, used experiment peach trees [Prunus persica (L.) Batsch] grown under field conditions. Iron-deficient shoots sprayed once re-greening was assessed over 6 weeks chlorophyll content (via SPAD measurements) percentage green area image analysis). Foliar always Chl increases, although degrees observed various tested. Best results obtained after treatment (in decreasing order): Fe(II)-sulfate, Fe(III)-EDTA, Fe(III)-IDHA, Fe(III)-DTPA. positive effect adding glycerol, glycine–betaine often observed, depended on Fe-containing compound, indicating existence significant interactions between spray components. Results are importance while trying critically evaluate potential sprays viable strategy remedy plant deficiency